Copper Conductors for Use in Hookup Wire for Electronic Equipment

B286-07 (Reapproved 2017): Standard Specification for Copper Conductors for Use in Hookup Wire for Electronic Equipment

In the demanding world of electronic equipment design and manufacturing, the integrity of every component is paramount. For engineers and designers specifying internal wiring, understanding the material properties of copper conductors is essential. ASTM B286-07 (Reapproved 2017), "Standard Specification for Copper Conductors for Use in Hookup Wire for Electronic Equipment," provides an authoritative framework for ensuring the quality and performance of these critical components, forming the backbone of reliable electronic systems.

What is B286-07 (Reapproved 2017)?

ASTM B286-07 (Reapproved 2017) is a comprehensive industry standard that defines the requirements for uninsulated metallic-coated copper conductors specifically intended for use in hookup wire within electronic equipment. Developed by ASTM International, this proven specification ensures consistency and quality in the metallic coatings applied to copper conductors, which are fundamental to the electrical performance and longevity of electronic devices.

Scope & Purpose

This standard governs the selection and properties of uninsulated copper conductors that are to be subsequently coated with tin, lead alloy, silver, or nickel. It details the requirements for both solid and stranded conductor constructions, ensuring they meet specific electrical and mechanical characteristics suitable for electronic applications. While it provides detailed specifications for conductor dimensions, metallic coating types, and temper, it does not cover insulated hookup wire itself or the complete manufacturing process of the wire.

Who Must Comply?

• • Primary Audience: Materials Engineers, Electrical Engineers, Manufacturing Engineers, Quality Assurance Inspectors, and Procurement Specialists involved in the design, production, or sourcing of electronic equipment.
• • Industries Affected: Electronics Manufacturing, Telecommunications, Aerospace, Automotive, Medical Devices, and any sector relying on intricate electronic circuitry.
• • Compliance Nature: Voluntary, but widely adopted as an industry best practice and often required by procurement specifications and design documents.
• • Enforcement: Typically enforced through internal quality control processes, supplier audits, and contractual agreements between manufacturers and their suppliers.

Key Requirements Overview

Professionals utilizing ASTM B286-07 (Reapproved 2017) must ensure their selected conductors meet the following core provisions:

• • Metallic Coating Adherence: The standard mandates that metallic coatings (tin, lead alloy, silver, or nickel) conform to the specific requirements outlined in referenced ASTM standards (e.g., B33, B298, B355).
• • Conductor Properties: It defines acceptable ranges for conductor dimensions, including nominal diameter and cross-sectional area, often referencing AWG sizes for clarity.
• • Electrical Resistance: Key provisions establish maximum allowable direct-current resistance at 20°C for both solid and stranded conductors, crucial for minimizing signal loss and heat generation.
• • Temper and Elongation: The specification addresses the temper of the conductors, typically requiring an annealed state, and sets elongation requirements to ensure ductility and prevent breakage during wire processing and installation.
• • Construction Specifics: For stranded conductors, it details parameters such as the number of wires, diameter of individual wires, and the length of lay to ensure consistent electrical and mechanical performance.

Related Standards & References